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local helpers = require("test.unit.helpers")(after_each)
local itp = helpers.gen_itp(it)
local eq = helpers.eq
local ffi = helpers.ffi
local cstr = helpers.cstr
local to_cstr = helpers.to_cstr
local child_call_once = helpers.child_call_once
local rbuffer = helpers.cimport("./test/unit/fixtures/rbuffer.h")
describe('rbuffer functions', function()
local capacity = 16
local rbuf
local function inspect()
return ffi.string(rbuf.start_ptr, capacity)
end
local function write(str)
local buf = to_cstr(str)
return rbuffer.rbuffer_write(rbuf, buf, #str)
end
local function read(len)
local buf = cstr(len)
len = rbuffer.rbuffer_read(rbuf, buf, len)
return ffi.string(buf, len)
end
local function get(idx)
return ffi.string(rbuffer.rbuffer_get(rbuf, idx), 1)
end
before_each(function()
child_call_once(function()
rbuf = ffi.gc(rbuffer.rbuffer_new(capacity), rbuffer.rbuffer_free)
-- fill the internal buffer with the character '0' to simplify inspecting
ffi.C.memset(rbuf.start_ptr, string.byte('0'), capacity)
end)
end)
describe('RBUFFER_UNTIL_FULL', function()
local chunks
local function collect_write_chunks()
rbuffer.ut_rbuffer_each_write_chunk(rbuf, function(wptr, wcnt)
table.insert(chunks, ffi.string(wptr, wcnt))
end)
end
before_each(function()
chunks = {}
end)
describe('with empty buffer in one contiguous chunk', function()
itp('is called once with the empty chunk', function()
collect_write_chunks()
eq({'0000000000000000'}, chunks)
end)
end)
describe('with partially empty buffer in one contiguous chunk', function()
itp('is called once with the empty chunk', function()
write('string')
collect_write_chunks()
eq({'0000000000'}, chunks)
end)
end)
describe('with filled buffer in one contiguous chunk', function()
itp('is not called', function()
write('abcdefghijklmnopq')
collect_write_chunks()
eq({}, chunks)
end)
end)
describe('with buffer partially empty in two contiguous chunks', function()
itp('is called twice with each filled chunk', function()
write('1234567890')
read(8)
collect_write_chunks()
eq({'000000', '12345678'}, chunks)
end)
end)
describe('with buffer empty in two contiguous chunks', function()
itp('is called twice with each filled chunk', function()
write('12345678')
read(8)
collect_write_chunks()
eq({'00000000', '12345678'}, chunks)
end)
end)
describe('with buffer filled in two contiguous chunks', function()
itp('is not called', function()
write('12345678')
read(8)
write('abcdefghijklmnopq')
collect_write_chunks()
eq({}, chunks)
end)
end)
end)
describe('RBUFFER_UNTIL_EMPTY', function()
local chunks
local function collect_read_chunks()
rbuffer.ut_rbuffer_each_read_chunk(rbuf, function(rptr, rcnt)
table.insert(chunks, ffi.string(rptr, rcnt))
end)
end
before_each(function()
chunks = {}
end)
describe('with empty buffer', function()
itp('is not called', function()
collect_read_chunks()
eq({}, chunks)
end)
end)
describe('with partially filled buffer in one contiguous chunk', function()
itp('is called once with the filled chunk', function()
write('string')
collect_read_chunks()
eq({'string'}, chunks)
end)
end)
describe('with filled buffer in one contiguous chunk', function()
itp('is called once with the filled chunk', function()
write('abcdefghijklmnopq')
collect_read_chunks()
eq({'abcdefghijklmnop'}, chunks)
end)
end)
describe('with buffer partially filled in two contiguous chunks', function()
itp('is called twice with each filled chunk', function()
write('1234567890')
read(10)
write('long string')
collect_read_chunks()
eq({'long s', 'tring'}, chunks)
end)
end)
describe('with buffer filled in two contiguous chunks', function()
itp('is called twice with each filled chunk', function()
write('12345678')
read(8)
write('abcdefghijklmnopq')
collect_read_chunks()
eq({'abcdefgh', 'ijklmnop'}, chunks)
end)
end)
end)
describe('RBUFFER_EACH', function()
local chars
local function collect_chars()
rbuffer.ut_rbuffer_each(rbuf, function(c, i)
table.insert(chars, {string.char(c), tonumber(i)})
end)
end
before_each(function()
chars = {}
end)
describe('with empty buffer', function()
itp('is not called', function()
collect_chars()
eq({}, chars)
end)
end)
describe('with buffer filled in two contiguous chunks', function()
itp('collects each character and index', function()
write('1234567890')
read(10)
write('long string')
collect_chars()
eq({{'l', 0}, {'o', 1}, {'n', 2}, {'g', 3}, {' ', 4}, {'s', 5},
{'t', 6}, {'r', 7}, {'i', 8}, {'n', 9}, {'g', 10}}, chars)
end)
end)
end)
describe('RBUFFER_EACH_REVERSE', function()
local chars
local function collect_chars()
rbuffer.ut_rbuffer_each_reverse(rbuf, function(c, i)
table.insert(chars, {string.char(c), tonumber(i)})
end)
end
before_each(function()
chars = {}
end)
describe('with empty buffer', function()
itp('is not called', function()
collect_chars()
eq({}, chars)
end)
end)
describe('with buffer filled in two contiguous chunks', function()
itp('collects each character and index', function()
write('1234567890')
read(10)
write('long string')
collect_chars()
eq({{'g', 10}, {'n', 9}, {'i', 8}, {'r', 7}, {'t', 6}, {'s', 5},
{' ', 4}, {'g', 3}, {'n', 2}, {'o', 1}, {'l', 0}}, chars)
end)
end)
end)
describe('rbuffer_cmp', function()
local function cmp(str)
local rv = rbuffer.rbuffer_cmp(rbuf, to_cstr(str), #str)
if rv == 0 then
return 0
else
return rv / math.abs(rv)
end
end
describe('with buffer filled in two contiguous chunks', function()
itp('compares the common longest sequence', function()
write('1234567890')
read(10)
write('long string')
eq(0, cmp('long string'))
eq(0, cmp('long strin'))
eq(-1, cmp('long striM'))
eq(1, cmp('long strio'))
eq(0, cmp('long'))
eq(-1, cmp('lonG'))
eq(1, cmp('lonh'))
end)
end)
describe('with empty buffer', function()
itp('returns 0 since no characters are compared', function()
eq(0, cmp(''))
end)
end)
end)
describe('rbuffer_write', function()
itp('fills the internal buffer and returns the write count', function()
eq(12, write('short string'))
eq('short string0000', inspect())
end)
itp('wont write beyond capacity', function()
eq(16, write('very very long string'))
eq('very very long s', inspect())
end)
end)
describe('rbuffer_read', function()
itp('reads what was previously written', function()
write('to read')
eq('to read', read(20))
end)
itp('reads nothing if the buffer is empty', function()
eq('', read(20))
write('empty')
eq('empty', read(20))
eq('', read(20))
end)
end)
describe('rbuffer_get', function()
itp('fetch the pointer at offset, wrapping if required', function()
write('1234567890')
read(10)
write('long string')
eq('l', get(0))
eq('o', get(1))
eq('n', get(2))
eq('g', get(3))
eq(' ', get(4))
eq('s', get(5))
eq('t', get(6))
eq('r', get(7))
eq('i', get(8))
eq('n', get(9))
eq('g', get(10))
end)
end)
describe('wrapping behavior', function()
itp('writing/reading wraps across the end of the internal buffer', function()
write('1234567890')
eq('1234', read(4))
eq('5678', read(4))
write('987654321')
eq('3214567890987654', inspect())
eq('90987654321', read(20))
eq('', read(4))
write('abcdefghijklmnopqrs')
eq('nopabcdefghijklm', inspect())
eq('abcdefghijklmnop', read(20))
end)
end)
end)
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